can't get the product id in single woocommerce page

Question

In the single woocommerce page where I have actions like woocommerce_before_single_product_summary to show the products, I can't access the product id. I tried the following codes and it didn't work :

$post->ID
get_the_ID()
$product->id
$product->get_id() 

Answer 1

If you're using $product and $post, then you need to use global $product; and global $post to get access to them. Did you do that?

global $product;

$product_id = $product->get_id();